It depends on your definition of bad. For example, if being different is bad, autism is bad. If viewing the world in a different way, perhaps noticing things that other people have missed, is good, autism is good.
There are characteristics of autism that make life more difficult for the person with autism and his or her family. There are characteristics that other people might envy, such as excellent memories. Whether or not autism is bad is a subjective view. You can get opinions, but not definitive answers to that question.